discussed Cited "see" Sutton v. Bell See Van Tran v. State, 6 S.W.3d 257, 264 (Tenn.1999), cert. denied, 529 U.S. 1091 , 120 S.Ct. 1728 , 146 L.Ed.2d 648 (2000) (establishing the procedure by which a death-sentenced prisoner may raise the issue of incompetence for execution).